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List all sequences in a Postgres db 8.1 with SQL
I'm converting a db from postgres to mysql.
19 Answers
19
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Check if a temporary table exists and delete if it exists before creating a temporary table
...aps I'm not understanding the problem.
The following works fine for me in SQL Server 2005, with the extra "foo" column appearing in the second select result:
IF OBJECT_ID('tempdb..#Results') IS NOT NULL DROP TABLE #Results
GO
CREATE TABLE #Results ( Company CHAR(3), StepId TINYINT, FieldId TINYINT...
Best practices for SQL varchar column length [closed]
Every time is set up a new SQL table or add a new varchar column to an existing table, I am wondering one thing: what is the best value for the length .
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Real escape string and PDO [duplicate]
I'm using PDO after migrating away from the mysql library. What do I use in place of the old real_escape_string function?
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SQL error “ORA-01722: invalid number”
...ou have to make it a String yourself, marking the value explicitly in your SQL expression, to surround it by ' ' OR " ".
– Franta
Jun 25 at 15:00
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Oracle PL/SQL - How to create a simple array variable?
I'd like to create an in-memory array variable that can be used in my PL/SQL code. I can't find any collections in Oracle PL/SQL that uses pure memory, they all seem to be associated with tables. I'm looking to do something like this in my PL/SQL (C# syntax):
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Unioning two tables with different number of columns
... when you're using set based operators so Kangkan's answer is correct.
SAS SQL has specific operator to handle that scenario:
SAS(R) 9.3 SQL Procedure User's Guide
CORRESPONDING (CORR) Keyword
The CORRESPONDING keyword is used only when a set operator is specified. CORR causes PROC SQL to match the...
How do you check if a certain index exists in a table?
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Just to add: "Beginning with SQL Server 2016 you can use the DROP INDEX IF EXISTS syntax." MS documentation
– heringer
Sep 1 '17 at 11:39
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SQL “between” not inclusive
...nted to display, export, import, or write a class with a datetime. I think SQL Server has plenty of built-in functionality to manipulate and compare datetimes for most purposes.
– Tim Lehner
May 3 '13 at 13:19
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How to store a list in a column of a database table
...abase design for no good reason. Since you state that you're just learning SQL, I would strongly advise you to avoid this idea and stick with the practices recommended to you by more seasoned SQL developers.
The principle you're violating is called first normal form, which is the first step in data...